linux/drivers/gpu/drm/tilcdc/tilcdc_drv.c

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/*
* Copyright (C) 2012 Texas Instruments
* Author: Rob Clark <robdclark@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* LCDC DRM driver, based on da8xx-fb */
#include <linux/component.h>
#include <linux/pinctrl/consumer.h>
#include <linux/suspend.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include "tilcdc_drv.h"
#include "tilcdc_regs.h"
#include "tilcdc_tfp410.h"
#include "tilcdc_panel.h"
#include "tilcdc_external.h"
static LIST_HEAD(module_list);
static const u32 tilcdc_rev1_formats[] = { DRM_FORMAT_RGB565 };
static const u32 tilcdc_straight_formats[] = { DRM_FORMAT_RGB565,
DRM_FORMAT_BGR888,
DRM_FORMAT_XBGR8888 };
static const u32 tilcdc_crossed_formats[] = { DRM_FORMAT_BGR565,
DRM_FORMAT_RGB888,
DRM_FORMAT_XRGB8888 };
static const u32 tilcdc_legacy_formats[] = { DRM_FORMAT_RGB565,
DRM_FORMAT_RGB888,
DRM_FORMAT_XRGB8888 };
void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
const struct tilcdc_module_ops *funcs)
{
mod->name = name;
mod->funcs = funcs;
INIT_LIST_HEAD(&mod->list);
list_add(&mod->list, &module_list);
}
void tilcdc_module_cleanup(struct tilcdc_module *mod)
{
list_del(&mod->list);
}
static struct of_device_id tilcdc_of_match[];
static struct drm_framebuffer *tilcdc_fb_create(struct drm_device *dev,
struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
{
return drm_gem_fb_create(dev, file_priv, mode_cmd);
}
static int tilcdc_atomic_check(struct drm_device *dev,
struct drm_atomic_state *state)
{
int ret;
ret = drm_atomic_helper_check_modeset(dev, state);
if (ret)
return ret;
ret = drm_atomic_helper_check_planes(dev, state);
if (ret)
return ret;
/*
* tilcdc ->atomic_check can update ->mode_changed if pixel format
* changes, hence will we check modeset changes again.
*/
ret = drm_atomic_helper_check_modeset(dev, state);
if (ret)
return ret;
return ret;
}
static int tilcdc_commit(struct drm_device *dev,
struct drm_atomic_state *state,
bool async)
{
int ret;
ret = drm_atomic_helper_prepare_planes(dev, state);
if (ret)
return ret;
ret = drm_atomic_helper_swap_state(state, true);
if (ret) {
drm_atomic_helper_cleanup_planes(dev, state);
return ret;
}
/*
* Everything below can be run asynchronously without the need to grab
* any modeset locks at all under one condition: It must be guaranteed
* that the asynchronous work has either been cancelled (if the driver
* supports it, which at least requires that the framebuffers get
* cleaned up with drm_atomic_helper_cleanup_planes()) or completed
* before the new state gets committed on the software side with
* drm_atomic_helper_swap_state().
*
* This scheme allows new atomic state updates to be prepared and
* checked in parallel to the asynchronous completion of the previous
* update. Which is important since compositors need to figure out the
* composition of the next frame right after having submitted the
* current layout.
*/
drm_atomic_helper_commit_modeset_disables(dev, state);
drm_atomic_helper_commit_planes(dev, state, 0);
drm_atomic_helper_commit_modeset_enables(dev, state);
drm_atomic_helper_wait_for_vblanks(dev, state);
drm_atomic_helper_cleanup_planes(dev, state);
return 0;
}
static const struct drm_mode_config_funcs mode_config_funcs = {
.fb_create = tilcdc_fb_create,
.output_poll_changed = drm_fb_helper_output_poll_changed,
.atomic_check = tilcdc_atomic_check,
.atomic_commit = tilcdc_commit,
};
static void modeset_init(struct drm_device *dev)
{
struct tilcdc_drm_private *priv = dev->dev_private;
struct tilcdc_module *mod;
list_for_each_entry(mod, &module_list, list) {
DBG("loading module: %s", mod->name);
mod->funcs->modeset_init(mod, dev);
}
dev->mode_config.min_width = 0;
dev->mode_config.min_height = 0;
dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
dev->mode_config.max_height = 2048;
dev->mode_config.funcs = &mode_config_funcs;
}
#ifdef CONFIG_CPU_FREQ
static int cpufreq_transition(struct notifier_block *nb,
unsigned long val, void *data)
{
struct tilcdc_drm_private *priv = container_of(nb,
struct tilcdc_drm_private, freq_transition);
if (val == CPUFREQ_POSTCHANGE)
tilcdc_crtc_update_clk(priv->crtc);
return 0;
}
#endif
/*
* DRM operations:
*/
static void tilcdc_fini(struct drm_device *dev)
{
struct tilcdc_drm_private *priv = dev->dev_private;
if (priv->crtc)
tilcdc_crtc_shutdown(priv->crtc);
if (priv->is_registered)
drm_dev_unregister(dev);
drm_kms_helper_poll_fini(dev);
drm_fb_cma_fbdev_fini(dev);
drm_irq_uninstall(dev);
drm_mode_config_cleanup(dev);
tilcdc_remove_external_device(dev);
#ifdef CONFIG_CPU_FREQ
if (priv->freq_transition.notifier_call)
cpufreq_unregister_notifier(&priv->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
#endif
if (priv->clk)
clk_put(priv->clk);
if (priv->mmio)
iounmap(priv->mmio);
if (priv->wq) {
flush_workqueue(priv->wq);
destroy_workqueue(priv->wq);
}
dev->dev_private = NULL;
pm_runtime_disable(dev->dev);
drm_dev_put(dev);
}
static int tilcdc_init(struct drm_driver *ddrv, struct device *dev)
{
struct drm_device *ddev;
struct platform_device *pdev = to_platform_device(dev);
struct device_node *node = dev->of_node;
struct tilcdc_drm_private *priv;
struct resource *res;
u32 bpp = 0;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
dev_err(dev, "failed to allocate private data\n");
return -ENOMEM;
}
ddev = drm_dev_alloc(ddrv, dev);
if (IS_ERR(ddev))
return PTR_ERR(ddev);
ddev->dev_private = priv;
platform_set_drvdata(pdev, ddev);
drm_mode_config_init(ddev);
priv->is_componentized =
tilcdc_get_external_components(dev, NULL) > 0;
priv->wq = alloc_ordered_workqueue("tilcdc", 0);
if (!priv->wq) {
ret = -ENOMEM;
goto init_failed;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "failed to get memory resource\n");
ret = -EINVAL;
goto init_failed;
}
priv->mmio = ioremap_nocache(res->start, resource_size(res));
if (!priv->mmio) {
dev_err(dev, "failed to ioremap\n");
ret = -ENOMEM;
goto init_failed;
}
priv->clk = clk_get(dev, "fck");
if (IS_ERR(priv->clk)) {
dev_err(dev, "failed to get functional clock\n");
ret = -ENODEV;
goto init_failed;
}
#ifdef CONFIG_CPU_FREQ
priv->freq_transition.notifier_call = cpufreq_transition;
ret = cpufreq_register_notifier(&priv->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
if (ret) {
dev_err(dev, "failed to register cpufreq notifier\n");
priv->freq_transition.notifier_call = NULL;
goto init_failed;
}
#endif
if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
if (of_property_read_u32(node, "max-width", &priv->max_width))
priv->max_width = TILCDC_DEFAULT_MAX_WIDTH;
DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
if (of_property_read_u32(node, "max-pixelclock",
&priv->max_pixelclock))
priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
pm_runtime_enable(dev);
/* Determine LCD IP Version */
pm_runtime_get_sync(dev);
switch (tilcdc_read(ddev, LCDC_PID_REG)) {
case 0x4c100102:
priv->rev = 1;
break;
case 0x4f200800:
case 0x4f201000:
priv->rev = 2;
break;
default:
dev_warn(dev, "Unknown PID Reg value 0x%08x, "
"defaulting to LCD revision 1\n",
tilcdc_read(ddev, LCDC_PID_REG));
priv->rev = 1;
break;
}
pm_runtime_put_sync(dev);
if (priv->rev == 1) {
DBG("Revision 1 LCDC supports only RGB565 format");
priv->pixelformats = tilcdc_rev1_formats;
priv->num_pixelformats = ARRAY_SIZE(tilcdc_rev1_formats);
bpp = 16;
} else {
const char *str = "\0";
of_property_read_string(node, "blue-and-red-wiring", &str);
if (0 == strcmp(str, "crossed")) {
DBG("Configured for crossed blue and red wires");
priv->pixelformats = tilcdc_crossed_formats;
priv->num_pixelformats =
ARRAY_SIZE(tilcdc_crossed_formats);
bpp = 32; /* Choose bpp with RGB support for fbdef */
} else if (0 == strcmp(str, "straight")) {
DBG("Configured for straight blue and red wires");
priv->pixelformats = tilcdc_straight_formats;
priv->num_pixelformats =
ARRAY_SIZE(tilcdc_straight_formats);
bpp = 16; /* Choose bpp with RGB support for fbdef */
} else {
DBG("Blue and red wiring '%s' unknown, use legacy mode",
str);
priv->pixelformats = tilcdc_legacy_formats;
priv->num_pixelformats =
ARRAY_SIZE(tilcdc_legacy_formats);
bpp = 16; /* This is just a guess */
}
}
ret = tilcdc_crtc_create(ddev);
if (ret < 0) {
dev_err(dev, "failed to create crtc\n");
goto init_failed;
}
modeset_init(ddev);
if (priv->is_componentized) {
ret = component_bind_all(dev, ddev);
if (ret < 0)
goto init_failed;
ret = tilcdc_add_component_encoder(ddev);
if (ret < 0)
goto init_failed;
} else {
ret = tilcdc_attach_external_device(ddev);
if (ret)
goto init_failed;
}
if (!priv->external_connector &&
((priv->num_encoders == 0) || (priv->num_connectors == 0))) {
dev_err(dev, "no encoders/connectors found\n");
ret = -ENXIO;
goto init_failed;
}
ret = drm_vblank_init(ddev, 1);
if (ret < 0) {
dev_err(dev, "failed to initialize vblank\n");
goto init_failed;
}
ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
if (ret < 0) {
dev_err(dev, "failed to install IRQ handler\n");
goto init_failed;
}
drm_mode_config_reset(ddev);
ret = drm_fb_cma_fbdev_init(ddev, bpp, 0);
if (ret)
goto init_failed;
drm_kms_helper_poll_init(ddev);
ret = drm_dev_register(ddev, 0);
if (ret)
goto init_failed;
priv->is_registered = true;
return 0;
init_failed:
tilcdc_fini(ddev);
return ret;
}
static irqreturn_t tilcdc_irq(int irq, void *arg)
{
struct drm_device *dev = arg;
struct tilcdc_drm_private *priv = dev->dev_private;
return tilcdc_crtc_irq(priv->crtc);
}
#if defined(CONFIG_DEBUG_FS)
static const struct {
const char *name;
uint8_t rev;
uint8_t save;
uint32_t reg;
} registers[] = {
#define REG(rev, save, reg) { #reg, rev, save, reg }
/* exists in revision 1: */
REG(1, false, LCDC_PID_REG),
REG(1, true, LCDC_CTRL_REG),
REG(1, false, LCDC_STAT_REG),
REG(1, true, LCDC_RASTER_CTRL_REG),
REG(1, true, LCDC_RASTER_TIMING_0_REG),
REG(1, true, LCDC_RASTER_TIMING_1_REG),
REG(1, true, LCDC_RASTER_TIMING_2_REG),
REG(1, true, LCDC_DMA_CTRL_REG),
REG(1, true, LCDC_DMA_FB_BASE_ADDR_0_REG),
REG(1, true, LCDC_DMA_FB_CEILING_ADDR_0_REG),
REG(1, true, LCDC_DMA_FB_BASE_ADDR_1_REG),
REG(1, true, LCDC_DMA_FB_CEILING_ADDR_1_REG),
/* new in revision 2: */
REG(2, false, LCDC_RAW_STAT_REG),
REG(2, false, LCDC_MASKED_STAT_REG),
REG(2, true, LCDC_INT_ENABLE_SET_REG),
REG(2, false, LCDC_INT_ENABLE_CLR_REG),
REG(2, false, LCDC_END_OF_INT_IND_REG),
REG(2, true, LCDC_CLK_ENABLE_REG),
#undef REG
};
#endif
#ifdef CONFIG_DEBUG_FS
static int tilcdc_regs_show(struct seq_file *m, void *arg)
{
struct drm_info_node *node = (struct drm_info_node *) m->private;
struct drm_device *dev = node->minor->dev;
struct tilcdc_drm_private *priv = dev->dev_private;
unsigned i;
pm_runtime_get_sync(dev->dev);
seq_printf(m, "revision: %d\n", priv->rev);
for (i = 0; i < ARRAY_SIZE(registers); i++)
if (priv->rev >= registers[i].rev)
seq_printf(m, "%s:\t %08x\n", registers[i].name,
tilcdc_read(dev, registers[i].reg));
pm_runtime_put_sync(dev->dev);
return 0;
}
static int tilcdc_mm_show(struct seq_file *m, void *arg)
{
struct drm_info_node *node = (struct drm_info_node *) m->private;
struct drm_device *dev = node->minor->dev;
struct drm_printer p = drm_seq_file_printer(m);
drm_mm_print(&dev->vma_offset_manager->vm_addr_space_mm, &p);
return 0;
}
static struct drm_info_list tilcdc_debugfs_list[] = {
{ "regs", tilcdc_regs_show, 0 },
{ "mm", tilcdc_mm_show, 0 },
};
static int tilcdc_debugfs_init(struct drm_minor *minor)
{
struct drm_device *dev = minor->dev;
struct tilcdc_module *mod;
int ret;
ret = drm_debugfs_create_files(tilcdc_debugfs_list,
ARRAY_SIZE(tilcdc_debugfs_list),
minor->debugfs_root, minor);
list_for_each_entry(mod, &module_list, list)
if (mod->funcs->debugfs_init)
mod->funcs->debugfs_init(mod, minor);
if (ret) {
dev_err(dev->dev, "could not install tilcdc_debugfs_list\n");
return ret;
}
return ret;
}
#endif
DEFINE_DRM_GEM_CMA_FOPS(fops);
static struct drm_driver tilcdc_driver = {
.driver_features = (DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET |
DRIVER_PRIME | DRIVER_ATOMIC),
.lastclose = drm_fb_helper_lastclose,
.irq_handler = tilcdc_irq,
.gem_free_object_unlocked = drm_gem_cma_free_object,
.gem_print_info = drm_gem_cma_print_info,
.gem_vm_ops = &drm_gem_cma_vm_ops,
.dumb_create = drm_gem_cma_dumb_create,
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_import = drm_gem_prime_import,
.gem_prime_export = drm_gem_prime_export,
.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
.gem_prime_vmap = drm_gem_cma_prime_vmap,
.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
.gem_prime_mmap = drm_gem_cma_prime_mmap,
#ifdef CONFIG_DEBUG_FS
.debugfs_init = tilcdc_debugfs_init,
#endif
.fops = &fops,
.name = "tilcdc",
.desc = "TI LCD Controller DRM",
.date = "20121205",
.major = 1,
.minor = 0,
};
/*
* Power management:
*/
#ifdef CONFIG_PM_SLEEP
static int tilcdc_pm_suspend(struct device *dev)
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct tilcdc_drm_private *priv = ddev->dev_private;
priv->saved_state = drm_atomic_helper_suspend(ddev);
drm/tilcdc: fix kernel panic on suspend when no hdmi monitor connected On BeagleBone Black if no HDMI monitor is connected and suspend is requested a kernel panic will result: root@am335x-evm:~# echo mem > /sys/power/state [ 65.548710] PM: Syncing filesystems ... done. [ 65.631311] Freezing user space processes ... (elapsed 0.006 seconds) done. [ 65.648619] Freezing remaining freezable tasks ... (elapsed 0.005 seconds) done. [ 65.833500] Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa30e004 [ 65.841692] Internal error: : 1028 [#1] SMP ARM <snip> [ 66.105287] [<c03765f0>] (platform_pm_suspend) from [<c037b6d4>] (dpm_run_callback+0x34/0x70) [ 66.114370] [<c037b6d4>] (dpm_run_callback) from [<c037ba84>] (__device_suspend+0x10c/0x2f4) [ 66.123357] [<c037ba84>] (__device_suspend) from [<c037d004>] (dpm_suspend+0x58/0x218) [ 66.131796] [<c037d004>] (dpm_suspend) from [<c008d948>] (suspend_devices_and_enter+0x9c/0x3c0) [ 66.141055] [<c008d948>] (suspend_devices_and_enter) from [<c008de7c>] (pm_suspend+0x210/0x24c) [ 66.150312] [<c008de7c>] (pm_suspend) from [<c008cabc>] (state_store+0x68/0xb8) [ 66.158103] [<c008cabc>] (state_store) from [<c02e9654>] (kobj_attr_store+0x14/0x20) [ 66.166355] [<c02e9654>] (kobj_attr_store) from [<c0185c70>] (sysfs_kf_write+0x4c/0x50) [ 66.174883] [<c0185c70>] (sysfs_kf_write) from [<c018926c>] (kernfs_fop_write+0xb4/0x150) [ 66.183598] [<c018926c>] (kernfs_fop_write) from [<c0122638>] (vfs_write+0xa8/0x180) [ 66.191846] [<c0122638>] (vfs_write) from [<c01229f8>] (SyS_write+0x40/0x8c) [ 66.199365] [<c01229f8>] (SyS_write) from [<c000e580>] (ret_fast_syscall+0x0/0x48) [ 66.207426] Code: e595c210 e5932000 e59cc000 e08c2002 (e592c000) This is because the lcdc module is not enabled when no monitor is detected to save power. However the suspend handler just blindly tries to save the lcdc state by copying out the pertinent registers. However module is off so no good things happen when you try and access it. This patch only saves off the registers if the module is enabled, and then only restores the registers on resume if they were saved off during suspend. Signed-off-by: Darren Etheridge <detheridge@ti.com> Tested-by: Dave Gerlach <d-gerlach@ti.com> Acked-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Jyri Sarha <jsarha@ti.com> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
2014-09-19 01:42:57 +00:00
/* Select sleep pin state */
pinctrl_pm_select_sleep_state(dev);
return 0;
}
static int tilcdc_pm_resume(struct device *dev)
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct tilcdc_drm_private *priv = ddev->dev_private;
int ret = 0;
/* Select default pin state */
pinctrl_pm_select_default_state(dev);
if (priv->saved_state)
ret = drm_atomic_helper_resume(ddev, priv->saved_state);
return ret;
}
#endif
static const struct dev_pm_ops tilcdc_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(tilcdc_pm_suspend, tilcdc_pm_resume)
};
/*
* Platform driver:
*/
static int tilcdc_bind(struct device *dev)
{
return tilcdc_init(&tilcdc_driver, dev);
}
static void tilcdc_unbind(struct device *dev)
{
struct drm_device *ddev = dev_get_drvdata(dev);
/* Check if a subcomponent has already triggered the unloading. */
if (!ddev->dev_private)
return;
tilcdc_fini(dev_get_drvdata(dev));
}
static const struct component_master_ops tilcdc_comp_ops = {
.bind = tilcdc_bind,
.unbind = tilcdc_unbind,
};
static int tilcdc_pdev_probe(struct platform_device *pdev)
{
struct component_match *match = NULL;
int ret;
/* bail out early if no DT data: */
if (!pdev->dev.of_node) {
dev_err(&pdev->dev, "device-tree data is missing\n");
return -ENXIO;
}
ret = tilcdc_get_external_components(&pdev->dev, &match);
if (ret < 0)
return ret;
else if (ret == 0)
return tilcdc_init(&tilcdc_driver, &pdev->dev);
else
return component_master_add_with_match(&pdev->dev,
&tilcdc_comp_ops,
match);
}
static int tilcdc_pdev_remove(struct platform_device *pdev)
{
int ret;
ret = tilcdc_get_external_components(&pdev->dev, NULL);
if (ret < 0)
return ret;
else if (ret == 0)
tilcdc_fini(platform_get_drvdata(pdev));
else
component_master_del(&pdev->dev, &tilcdc_comp_ops);
return 0;
}
static struct of_device_id tilcdc_of_match[] = {
{ .compatible = "ti,am33xx-tilcdc", },
{ .compatible = "ti,da850-tilcdc", },
{ },
};
MODULE_DEVICE_TABLE(of, tilcdc_of_match);
static struct platform_driver tilcdc_platform_driver = {
.probe = tilcdc_pdev_probe,
.remove = tilcdc_pdev_remove,
.driver = {
.name = "tilcdc",
.pm = &tilcdc_pm_ops,
.of_match_table = tilcdc_of_match,
},
};
static int __init tilcdc_drm_init(void)
{
DBG("init");
tilcdc_tfp410_init();
tilcdc_panel_init();
return platform_driver_register(&tilcdc_platform_driver);
}
static void __exit tilcdc_drm_fini(void)
{
DBG("fini");
platform_driver_unregister(&tilcdc_platform_driver);
tilcdc_panel_fini();
tilcdc_tfp410_fini();
}
module_init(tilcdc_drm_init);
module_exit(tilcdc_drm_fini);
MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
MODULE_DESCRIPTION("TI LCD Controller DRM Driver");
MODULE_LICENSE("GPL");